Lampholder



- F. DEUTSCH Jan. 9, 1934.

LAMPHOLDER Filed Jan. 23, 1932 gums; BY W W C 4 ATTORNEY Patented Jan.9, 1934 UNITED STATES 1,942,804. LAMPHOLDER Fritz Deutsch, Kreuzlingen,Thurgau,

Switzerland Application January 23, 1932. Serial No. 588,307 4 Claims.(01. 2 i085) I-leretofore there was a great difference in constructionbetween lampholders of the bayonet and the Edison types of glow-lampsockets. This difference in construction always proved to be a greatdisadvantage especially with fittings of a better quality, for instance,porcelain fittings for ceilings and walls. In such cases, holder partsdesigned for one of these types could not be easily replaced or used forparts of the other type.

The following is a description of a preferred embodiment of my inventionwhich entirely removes all of the above-noted difliculties andobstacles. At the same time, the preferred construction embodied hereinhas advantages hitherto unattained in constructions of either type.

One of the advantages of the present embodiment is that of fastening orattaching the lamp to a ceiling or to walls with screws that are hiddenfrom view. This point will be treated more in detail in connection withthe description of the present embodiment.

The primary object of this invention is to obtain a separation of allparts used for the construction of lampholders for ceilings and walls.

With the above object in view, there is conformity of many of thecomponent parts whereby the fitting is adapted for connection with thebayonet and Edison type of sockets. In the present embodiment, themanner of producing contact with the several parts holding the lampproper must conform to the particular types used in order to beadaptable to the diiferences in both systems.

The invention in its preferred embodiment consists in a new and novellampholder, in the new and novel features of construction, and the newand original arrangement and combination of parts hereinafter describedand more particularly set forth in the appended claims.

In the drawing:-

Figure 1 shows a cross section partly cut away through one form of theembodiment and a cross section of the part of wiring holding unitdepending from the ceiling. The latter part contains means providingcontacts for the glow-lamp socket of the bayonet type. This is sodesigned as to diminish the number of the metal fittings required. Thepart for holding the lamp is shown in a front view, on the left side,whereas the right side gives the sectional view;

Fig. 2 is a cross section of a socket of the Edison type and contactsfor the socket taken on line A-A in a vertical plane in Figs. 3 and 4.Part of the depending portion with wire socket to the right of thefigure is shown cut away. There is here an entire conformity of view ofthe parts for holding the lamps, in Figs. 1 and 2, only that thesectional view makes the difference in the appliances for holding thelamps apparent 6 in either system;

Fig. 3 is abottom plan View of the base member in Fig. 2 for holding theend of the wires fromthe ceiling;

' Fig. l is a top plan view of the lower part of 6 the lamp socketadapted for the Edison type.

This is done in order to elucidate, as a result of their construction,the respective positions of the parts when connected; and

Fig. 5 illustrates a schematic modified construction where the sameprinciple and disposition of parts in the above illustrations areapplied to an inclined wall lampholder. The same parts of the embodiedtypes above shown are used in Fig. 5 with the exception that the basalsupporting members for the lamp and the globe socket and cover arediiferently disposed. Here the parts forming the foundation of the wholeconstruction and the attachments are shown in a side view, whereas thecover is represented in a sectional view.

Similar reference characters designate corresponding parts throughoutthe drawing.

Referring to the drawing wherein simple and practical embodiments of myinvention are shown, 10 is a mechanical supporting plate common to bothtypes. of socket, depending from ceiling l4, and 11 is a recessed blockconnected to said supporting plate and is made of highly insulatingmaterial. Referring to the bayonet type of socket shown in section inFig. l, the plate 10 and block 11 are provided with a central opening inwhich an engaging screw 12 and a nut 13 are provided for holding saidplate 10 with said block. It is to be noted that block 11 has openings11 in alignment with openings 11" in plate 10, for accommodating theterminals 14' of a cable, extending from the ceiling. The dependingmember 13' fitting into the recessed block 11 is provided withoppositely disposed engaging screws 12 for the terminals 14' of thecable, and a pair of spring bushing pins or tongues 29 for makingcontact with an electric bulb.

It is to be noted that the member 13 is preferably of metal and iscontained by the insulation block 11.

It may be noted that the upper parts already described are afiixed tothe ceiling or wall 14 and connected with the terminals of the cable soas to be easily reached. A porcelain cover memunited with the lampholderl9,

, conducting parts.

ber 15 used in both types shown in Figs. 1 and 2, has at its lower endan opening 16 to conceal the base of the lamp to be connected and is sodesigned as to prevent contact with live electric Said cover member whenceiling 14 encloses the mechanical supporting plate 10, block 11 andmembers 13' to conceal them from view. The upper end of opening 16contains an interior peripheral shoulder 17 for a ring 18 which is aboutone-eighth 4;) inch broad and the same in height, and which is adaptedto engage a socket member 19 having an externally threaded portion 20.Although the dimensions of the ring 18 are given, it is to be understoodthat I do not limit myself thereto. Above the peripheral shoulder 17there is an opening in the cover member 15 sufiiciently large to allowthe socket member 19 to be inserted. The socket member 19 althoughthreaded on its outer and lower portion 20, has its interior lowerportion either slotted at 19, according to Figure l, to accommodate theprojecting pins of a bulb of the bayonet type or internally threadedaccording to Figure 2, to accommodate a bulb of the threaded Edisontype. The outer diameter of the lampholder socket member 19 is smallerthan the peripheral shoulder 17 at the end of the opening 16. At thelower end of the lampholder or socket member 19 there is a flangelikeextension 21, the diameter of which is somewhat larger than theperipheral shoulder 17, but slightly smaller than the opening 16 ofcover member 15. In the peripheral shoulder 17 there are hollows 22 intowhich the projecting lugs 23 of the socket member 19 enter and are heldin rigid position. By this contrivance, the socket member 19 is heldimmovable in the cover 15, thus permitting the ring 18 to be turned andtightened. In this manner the cover 15 is closely thus forming a it maybe hanpushed toward the one-piece attachment so that dled as one partonly.

The lampholder or socket upper extension with a member 19 has an portioncut away to form opposite supports 25 with lateral projections. 26

with openings and extending toward the longitudinal axis of the holder.Said projections 26 rest against the mechanical supporting plate 10 andare held in engagement therewith by means of screws 27, projectingupwardly as shown in screws.

Figs. 1 and 2. In order to prevent the screws 27 from falling out of theopenings when loose in the projections, I provide small perforated discs28 which fit tightly against the thread of said, These projections 26,found in every set and opposing each other, leave sufficient space toinsert the insulating block 11, the profile of which is made to fitbetween supports 25 at this point in order to have a proper guide forthelower part. Thus it is possible in the bayonet type of socket to givethe lampholder 19 containing the guide slots for the lamp pins theproperposition with respect to the spring, bushings 29 of the extension theother hand, screws 27 to screws 27 into the nut holes 30 by means of ascrew driver applied from the bottom through the opening in the middleof the supports 25.

Instead of using a socket member as shown in Fig.1, as applied to thebayonettype of lamps or bulbs, a socket member with an internallythreaded portion may be used as shown in Fig. 2 for a bulb having athreaded end portion. In either case, it is easy to provide thelampholder having the same general constructional features.

From the foregoing description, it will be noted that I provide aneasily replaceable lamp socket, a holder for said socket to conceal thecomponent connecting parts, and means around the socket for retainingthe holder and the socket in relative position.

The advantages of lampholders constructed according to my invention are:

Uniformity for a great many parts is present in both forms so that theholder may be used in bayonet as well as in the Edison type of lamps.Such lampholders can be easily applied and attached to wires extendingfrom walls or ceilings. Furthermore, a lampholder made according to myinvention is secure in its application and can be made of any shape toaccommodate the metal end of a lamp. Furthermore, a lampholder madeaccording to my invention may be of any form, shape or size. Also, itsstructure may be made of any material, as metal, porcelain, glass,pressed insulation material and formed to suit any requirement.

Furthermore, inclined lampholders as schematically shown in Fig. 5, maybe used only with slightly dilferent sockets and covers, whereas theother parts remain the same. Another advantage is that all parts, withthe exception of course of the contact members proper, including thevarious screws for fastening the parts, may be made of pressedinsulating material not liable to oxidize, corrode or rust, thus makingthese lamps especially suitable for places exposed to moisture, such. asbathrooms, toilet rooms and ships, as well as in the open air, all themore, as the few metal fittings, are easily interchangeable.

While I have described preferred embodiments of the invention inconnection with the accompanying drawing, it is to be understood thatvarious modifications as to form, size, shape and material may be madewithout departing from the spirit and scope of the invention.

I claim:

1. A lamp bulbholder for attachment to ceilings, and the like comprisingan insulating mechanical supporting plate mounted to said ceiling andhaving openings therein for the passage of terminals, of an electricconductor therethrough, a recessed insulation block depending from the.supporting plate and having openings in. alignment with, those of theplate, means for engaging said block and plate, a plurality of metalcontact pieces mounted in the block in connection with the terminalsofsaid conductor. for connection with a lamb bulb, a socket member havingupwardly extending oppositely disposed spaced supports forming anintermediate space for saidinsulation block, lateral extendingoppositely disposed. projections for resting against said supporting,plate, means for engaging said projectionsv with the supporting plate,and a cover member enclosing said, socket member, block and plate.

2. An electric bulb holder device for mounting on ceilings and, the1ike,,comprising an insulating said openings in connectionwith theterminals and depending from the block for making contact with the metalportion of an electric bulb, means engaging the block with themechanical supporting plate, a socket member for the electric bulb andhaving oppositely disposed projecting pieces in connection with theplate, forming an intermediate space for accommodating the block, theexterior surface of said member being threaded and having an externallyflanged portion, a cover member for enclosing the socket member,supporting plate and block, having an opening with an inwardly extendingperipheral shoulder abutting the flanged portion of the socket member,and an engaging ring around the threaded portion of the socket memberfor sustaining said covering member in position against the flangedbottom portion of the socket member whereby only said covering member isexposed to view' 3. A holder for electric bulbs comprising an insulatingmechanical supporting plate mounted on a ceiling, having openingstherein for the terminals of an electric conductor, a block connectedwith said plate, a metal spring bushing in the block in connection witheach of said openings for engagement with said terminals, said bushingslying adjacent each other in the same plane, an insulating lamp holderforming a connection with the bushings and having an exterior peripheralflange at the bottom portion thereof, and a pair of oppositely disposedextensions for engagement with the mechanical supporting plate, saidextensions forming an intermediate space for said bushings, an enclosingmember for the lampholder, insulating plate, block and bushings havingan open, shouldered central portion abutting against the flange of thesocket member, and adapted to be brought adjacent the ceiling andenclose said parts from view, annular means intermediate the socket andthe enclosing members for retaining them in relative engagement, andfastening means connecting the socket with the supporting plate forforming a unitary construction.

4. In an electric lampholder for ceilings and the like, an insulatingmechanical supporting plate mounted to the ceiling, an insulating blockconnected to the plate, spaced metal members in the block for makingcontact with the terminals of an electric conductor, and with the lamp,a non-conducting socket member for the lamp having spaced longitudinallyextending portions forming an intermediate space, and arms angularlyextending from said portions for fitting into the block, said armshaving openings, and means passing through the openings of said arms forconnecting the socket member to the insulating plate.

FRITZ DEUTSCH.

